int loopCount = 20;
int plusValue = 5;

void setup() {
  size(300,165);
  background(#FFFFFF);
  smooth();
  noLoop();
  noStroke();
}

void draw() {
  for (int i = plusValue; i < (plusValue * loopCount); i += plusValue) {
    fill(color(
      random(0, 255),
      random(0, 255),
      random(0, 255),
      random(0, 100)
    ));

    float xPos = random(0, width);
    float yPos = random(0, height);

    if (xPos < i) {
      xPos = i;
    }

    if (yPos < i) {
      yPos = i;
    }
    ellipse(xPos, yPos, i, i);
  }
}